<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        h1{
	        color: rgb(255,255,255);
            color: rgb(255,255,0);
	        color: rgb(255,0,0);
            color: rbg(0,0,0);
        }
        h2{
            color: rgba(255,0,0,0.5);
        }
        .d1{
            width: 100px;
            height: 200px;
	        background-image: url("img/mv.jpg");
            background-size: 110px 200px;
            background-color: wheat;
        }
        .d2{
            width: 1150px;
            height: 1150px;
            border: 5px solid red;
            background-image: url("img/mv.jpg");
            background-size: 150px 200px;
            background-repeat: no-repeat;

            /*background-position: 550px 550px;*/
            /*background-position: center;*/
            /*background-position: 1% 1%;*/
            background-position: 50% 50%;
        }
        .d3{
            height: 300px;
            width: 400px;
            background-image: linear-gradient(30deg,red,orange,yellow,green,cyan,blue);
        }
    </style>
</head>
<body>
    <h1>测试颜色</h1>
    <h2>测试颜色</h2>
    <h3>测试颜色</h3>
    <div class="d1"></div>
    <div class="d2"></div>
    <div class="d3"></div>

</body>
</html>